Hook Cerliani - Special Coatings User Manual
Cerliani special coatings
Since years CERLIANI is engaged in constant research for new material and coatings that
permit to improve further the performances of the hook.
For this reason special testing machines and measurement devices have been developed to
test the various materials. In particular, CERLIANI's Research and Design Department has
designed and realized testing equipments, which through simulation of the hook's working
conditions, test the following parameters:
service life of the hook.
transitory temperatures of the hook under all different working conditions.
friction moment between basket and hook.
dimensional control of the coatings' thickness.
control of geometric errors and surface roughness.
uniformity control of the coatings.
structural control of the material.
These means, enforced by a strict testing procedure regulated according proper and special
norms, have allowed to test and to compare hundreds of solutions, whose results are
rigorously recorded in the company's database and are part of CERLIANI's know-how.
This research has involved countless suppliers, specialist s and also several Italian and foreign
Universities.
Among the best-achieved results only a few have been selected for the commercialization, that
is those, which presented the best price/performance ratio.
Further CERLIANI has chosen to back diversified solutions on the basis of the different market
segment requirements.
For this reason among the gamut of coatings proposed by CERLIANI for her own hooks, the
ones presented in the following technical data sheet stand out in particular.
As a general consideration bear in mind the following advice that is valid for every type of
hook, for every type of material and coating and for every manufacturer:
The regular cleaning of the sewing machines prolongs the service life of the components,
improves the sewing performances, reduces the machine downtime and reduces the
maintenance costs.
It is therefore a good rule, at least at the end of every working shift, to remove the bobbin
case and to clean (e.g. with compressed air) the hook and the surrounding area an d to clean
delicately the bobbin case underneath the tension spring (e.g. by blowing air).
If possible, it is also a good rule to put a drop of oil into the race of the hook and let the
sewing machine turn idle for a few seconds at maximum speed.
These operations permit to remove the thread residual that is always very abrasive and
detrimental to the life of the components and to the sewing performances.
The more the thread is thick and abrasive, the more often it would be appropriate to rem ove
the debris for the moving parts of the sewing machine.
ASPECT
NAME
COATING’S
APPLICATION
Cerliani special coatings
PROPERTIES
STANDARD COATING
PERFORMANCES
LUBRICATION
APPLICATION
FIELDS
-shining
-dull black
-glossy
yellow-gold
-glossy
black
-glossy
black
Hard
chromium
-on the basket
SPECIAL COATING ON REQUEST
TS
-on the basket
TTN
-on the basket
DC20
-on the basket
DC10
-on the hook body,
gib and basket
-high hardness
(1050 HV)
-high coating
thickness
(0.02mm)
-Galvanic
chromium
coating
-low hardness
-high coating
thickness
(0.2 mm)
structure on
chromium
substratum
-high hardness
(2500 HV)
-very thin
coating
thickness (4
-TiN structure
(Titanium
Nitride)
-extreme high
hardness
(3000 HV)
-very thin
coating
thickness (3
structure
-extreme high
hardness
(3000 HV)
-very thin
coating
thickness (3
-uniform
structure
-PTFE
μm)
μm)
-layer
μm)
-low friction coefficient
-dry sewing with little oil up
to 800 ÷1000 stitches per
minute
-sewing up to 6000 stitches
per minute with regular
lubrication
-smooth rotation between
basket and hook
-proven reliability
-low friction coefficient
-dry sewing with little oil up
to 800 ÷1000 stitches per
minute
-smooth rotation between
basket and hook
-proven reliability
-dry sewing up to 3500
stitches per minute
-sewing with reduced
lubrication up to 4500
stitches per minute
-sewing with low tensions
up to 6000 stitches per
minute with regular
lubrication
-low friction coefficient in
any working condition
-wear-resistance of the
basket
-proven reliability
-dry sewing up to 3500
stitches per minute. Peaks
up to 4000 stitches per
minute are possible.
-low friction coefficient
-high wear-resistance of the
basket
-long service life even with
dry sewing
-reliability
-dry sewing up to 4000
stitches per minute
-low friction coefficient
-extremely high wear-
resistance of the whole hook
through coating both race
and hook point
-very long service life (effect
is even more evident when
abrasive threads are used)
-proven reliability
-not necessary
within the
indicated
conditions.
-not necessary
-not necessary
within the
indicated
limits. One
drop of oil
every 8 hours
enhances
however the
performance
-not necessary
within the
indicated
conditions. If
present, it can
enhance the
performances
of endurance
and
smoothness
-not necessary
within the
indicated
conditions. If
present, it can
enhance the
performances
of endurance
and
smoothness
Every Field:
From household
sewing machines to
high speed machines.
-in embroidery to
improve the sewing
qualities
-in light dry sewing
at limited speed with
low thread tensions
-in light sewing for a
high stitching quality
with low thread
tensions
-in sewing with
synthetic threads
-in the corsetry field
-in applications with
overheating problems
of the hook
-medium-heavy
sewing with wear
problems of the race
and excessive
increase of the play
-where it is
necessary to replace
often the basket due
to the wear
-embroidery with dry
stitching for a long
service life of the
hook.
-in the presence of
very abrasive threads
(very heavy sewing)
-where dry sewing at
high speed is
required
-where there are
problems of great
wear also on the
point of the hook
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